Twine wrapping apparatus with trip mechanism actuated twine dispensing member

Claim 1

In a roll baling machine having means for forming crop material into roll bales, and apparatus for wrapping the roll bales with twine, said apparatus comprising: a twine dispensing arm mounted for pivoting movement to dispense twine; clamp means for clamping the twine dispensed by said twine dispensing arm, said clamp means including a stationary jaw member and a movable jaw member, said jaw members having end portions defining a mouth therebetween for receiving the twine, said movable jaw having a closed position wherein twine is clamped between said jaw members and an open position wherein twine is released from said jaw members, said clamp means also including a stationary knife disposed adjacent said mouth for severing the twine; and trip means connected to said clamp means, said trip means being actuated by said twine dispensing arm during its pivoting movement to release the twine from said clamp means, said trip means including a control rod connected at one end to said movable jaw member, said trip means also including a pin movably mounted on the other end of said control rod for engagement with said twine dispensing arm, said pin being movable from a trip position to an actuating position for actuating said control rod in order to move said movable jaw member into said open position, said pin also being movable from said trip position to a non-actuating position without actuating said control rod so that said movable jaw member remains in said closed position, said trip means further including a spring urging said pin into said trip position, said pin being moved from said trip position to said actuating position when said twine dispensing arm is moving in one direction, and said pin being moved from said trip position to said non-actuating position when said twine dispensing arm is moving in another direction.